http://www.fallout3nexus.com/downloads/file.php?id=566
Installation:
--------------
1. Extract your chosen map type (colour/monochrome) from the
relevant .zip file into:
Fallout3\Data\Textures\Interface\Worldmap
(you will likely have to create the directory tree)
3. Open (My)Documents\My Games\Fallout3\Fallout.ini
4. Search for the string "bInvalidateOlderFiles=0" (no quotes)
5. Change it to "bInvalidateOlderFiles=1"
6. Play, and set your Pipboy colour to the setting you think
works best with the map type you've chosen.
http://www.fallout3nexus.com/downloads/file.php?id=586